A good friend killed himself after his doctors put him on meds. We will never know what really happened but it turns out that lots of psychiatric medications first become "effective" in the "drive" department rather than lighten depression syndromes. Not a good dynamic at all when you are already in a suicidal state.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2824975/
Not saying these meds don't work, they actually might work "too well" in some ways and that surveillance of and constant checking-in with patients is very important especially at the beginning and during periods after stopping treatment.